Final answer:
The Institute of Electrical and Electronics Engineers (IEEE) defines standards for the network access layer (OSI physical and data link layers).
Step-by-step explanation:
The organization that defines standards for the network access layer (i.e., the OSI physical and data link layers) is the Institute of Electrical and Electronics Engineers (IEEE).
The IEEE is responsible for developing and maintaining standards for various areas of technology, including networking. The standards they define for the network access layer ensure compatibility and interoperability between different networking devices.
For example, IEEE 802.3 is the standard for Ethernet, which is widely used in local area networks (LANs) to connect computers and other devices.